diff --git a/src/net/pwendland/javacard/pki/isoapplet/IsoApplet.java b/src/net/pwendland/javacard/pki/isoapplet/IsoApplet.java
index 9d4ef599..eccb74a9 100644
--- a/src/net/pwendland/javacard/pki/isoapplet/IsoApplet.java
+++ b/src/net/pwendland/javacard/pki/isoapplet/IsoApplet.java
@@ -1442,7 +1442,7 @@ private void importPrivateKey(APDU apdu) throws ISOException {
             recvLen = doChainingOrExtAPDU(apdu);
 
             // Parse the outer tag.
-            if(ram_buf[offset] != (byte)0x7F && ram_buf[offset] != (byte)0x48) {
+            if(ram_buf[offset] != (byte)0x7F && ram_buf[(short)(offset+1)] != (byte)0x48) {
                 ISOException.throwIt(ISO7816.SW_WRONG_DATA);
             }
             offset += 2;